Universal mechanical odometer with black background and chromed steel body. The odometer is backlit with white light and can be installed on most Japanese custom bikes. Very simple to install, it is equipped with a chromed bracket for fixing. Ø 60 mm. Ratio 2: 1 - K = 1,4: 1400 (speedometer cable revolutions) = 1km = 1400rpm = 60km / h. Threaded fixing pin Ø 12mm. To check the wheel ratio (K) of your motorcycle proceed as follows: Calculation of K: K = 10 X / U. X = number of turns made by the speedometer cable by turning the wheel 10 times U = wheel circumference. To learn more about the compatibility of mechanical odometers click here